What are the two switches on the 88's evaporator hose (the one with the high pressure side fitting on it)?

One looks like a low pressure side switch (maybe a high pressure side switch? The local parts store said this car didn't have one), and the other is just an electrical connector.

The diagram in my service manual just points to them and says "Switch". :skep:

 

Anyone at all? Seems I'm not having many responses in the forum lately. Did I forget my deodorant?

 

Are you talking about the hoses on the A/C assembly???
If I'm wrong which ones are you talking about?????
thanks
tony
:smash: :smash: :smash:

 

Right. There's a metal line going between the evaporator and the condensor. On this line is the high pressure side fitting, and two electrical connections. It's these two connections that I'm curious about.

I've read that the AC lines on the 88 are different than other years, and I'm not familiar with what exactly the differences are. So you'll have to forgive me if it's different on a non 88.

 

Does this help?

 

Whoa, I guess it doesn't. Must've lost something in the translation! :D

I can send it to you in a better format, if you'd like.

 

I appreciate the picture.

It answers my question, but it raises others. Now I'm thoroughly confused.

I was under the impression that my low pressure cycle switch was on the upper line of the upper evaporator hose (the one that goes into the accumulator). It's at sort of a t-bone right as it connects to the accumulator. It's not there at all in the picture you've posted, but it's there in my service manual.

However, my manual says that it goes into the dryer itself, like on most cars I've worked on. There's nowhere for it to go into on a stock GM dryer as far as I can tell, but the connection is there (and blocked off) on the aftermarket dryer I installed when I converted to r134a. So I can assume I can install it on either one and it will work, but I'll keep it at the T where the hose connects to the evaporator since it was obviously designed this way.

So the only thing I can really assume is that the connection (#13 in your diagram) is a high pressure side switch and not a low pressure side switch.
I have no idea what the eng cool switch would be on an air conditioning line.

I looked up the part number in the diagram and it just says "Switch". It must have been taking lessons from my service manual.

Anyway, I'll just call my local Chevy dealership and ask them what's up.

Again, I appreciate your diagram.

 

Okay, one of the switches apparently controls the radiator fan. I hooked the switch connections to my old line (which is stripped, so it's useless for holding pressure) and my radiator fan no longer kicks on as soon as I start the car.

This is what I was trying to troubleshoot in the first place, but I figured it HAD to be something to do with that line since it's the only thing I've replaced. With it connected to the old line the fan kicks on when it's supposed to rather than immediately.

I'm glad the service manual gives us these "blank" pages.. I've got a lot of stuff I've had to write in.